WordPress has 2 sides. One side is what everyone sees when they visit your site. The other side is the administration side.
To login to your administration side, the url will be http://yourdomainname.com/wp-admin/
Bookmark it in your browser 🙂 This is where you will be going to get to your dashboard. You’ll manage your entire site through the dashboard. The first time you go to that link it will redirect you to a login link. Put in your username and password that was determined during the installation and save it in your browser if you’d like. Then when you visit the link again, it will take you directly to your dashboard.